Description And Operation

DESCRIPTION 

• The Diesel Exhaust Fluid (DEF) injector is similar to a fuel injector, but modified to be compatible with the Urea fluid. The DEF injector is mounted to the front of the Selective Catalytic Reduction (SCR) catalyst and is designed to operate in a underbody environment.

OPERATION 

• The Diesel Exhaust Fluid (DEF) Injector is mounted to the mixer tube at the inlet of the Selective Catalytic Reduction (SCR) Catalyst. The Powertrain Control Module (PCM) sends a Pulse Width Modulated (PWM) signal to the DEF Injector to vary the amount of fluid sprayed into the exhaust stream.